Hang Si

Research Group: Numerical Mathematics and Scientific Computing
Weierstrass Institute for Applied Analysis and Stochastics (WIAS)

Mohrenstr. 39
10117 Berlin,

Tel: +49(0) 30 20372 446
Fax: +49(0) 30 2044975


Welcome to Hang Si (斯杭)'s homepage!

I'm a scientific staff member of the Weierstrass Institute for Applied Analysis and Stochastics (WIAS) in the research group of Numerical Mathematics and Scientific Computing.

I work in the field of automatic mesh generation, which is a topic about how to partition a geometric domain into a set of simple (non-overlapping) cells. It has wide variety of applications: mathematical modeling, computer-aided design, visualizations, and so on. It combines different topics from mathematics, computer science, and engineering. It principally requires the studies of discretizing a continuous space in both of its topology and geometry. My primary investigations are the existence and the complexity of such a discretization. Many questions of this study stem from problems in discrete and combinatorial geometry.

Three papers will be appear in the journal Computer-Aided Design.

Our paper "On tetrahedralisations containing knotted and linked line segments" was presented in 26th International Meshing Rountable in September 18--21, 2017, Barcelona.

Here is one of my recent talks on "3d irreducible and indecomposable polyhedra and the number of interior Steiner points", given in the NUMGRID 2016 conference, Oct. 31 - Nov. 2, 2016 in Moscow, Russia.

For details of my current research, please take a look at the list of my publications.

I'm developing a software, TetGen, which is used to implement state-of-the-art methods and algorithms for constructing Delaunay tetrahedralizations and quality tetrahedral meshes. It is one of the best ways to connect "methods" and "results". On the other hand, to provide a robust and efficient meshing tool for solving practical problems in engineering is also very meaningful.

I was the co-orginizer of the 25th International Meshing Roundtable (IMR), September 26-30, 2016, Washington DC. It is an international focal point on research and development of mesh generation annually. The proceedings of this conference is now available online at here .

I gave a course on "Mesh Generation Methods and Softwares" in the 2017 International Summer School of Beihang University (Beijing University of Aeronautics and Astronautics), from July 11-26, 2017, in Beijing. This course is suitable for senior and graduate students in engineering, computer science, and applied mathematics.

A short biography I was born and grew up in Hangzhou (杭州), a city famous for its natural beauty and historical culture in the Zhejiang province of China. I received my B.E. degree in Electrical Engineering of the Hangzhou University (now merged in Zhejiang University) in July, 1994, and my M.S. degree in Computer Science of the Zhejiang University in March, 2002. In between of my two college studies, I've worked as an electrical engineer and a software developer for five years. I jointed WIAS Berlin in October, 2002 and have been working here since then. In August 2008, I got my Ph.D from the Institute für Mathematik in Technische Univerisität Berlin under the supervisor of Prof. Günter Ziegler and Herbert Edelsbrunner.

Last update: today